rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=5f4c/1/0x4000000000000000 softirq=95520/95520 fqs=1
	(detected by 1, t=10504 jiffies, g=152201, q=25 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25439 Comm: syz.3.6938 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1749 [inline]
RIP: 0010:__hrtimer_run_queues+0x4d7/0xc90 kernel/time/hrtimer.c:1815
Code: 05 e8 5d 1b 10 00 49 8d 5d 3b 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 eb 02 00 00 0f b6 1b 31 ff 89 de e8 99 1d 10 00 <85> db 74 11 e8 30 1b 10 00 4c 89 ef ff 54 24 50 41 89 c4 eb 4d e8
RSP: 0018:ffffc90000007d60 EFLAGS: 00000006
RAX: ffffffff81724d67 RBX: 0000000000000000 RCX: 0000000000010000
RDX: ffff888044af8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007eb0 R08: ffffffff8f22416f R09: 1ffffffff1e4482d
R10: dffffc0000000000 R11: fffffbfff1e4482e R12: 0000000000000002
R13: ffff888058ba8340 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f9b0cff96c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe65c8134c8 CR3: 000000002fbcf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:page_fixed_fake_head include/linux/page-flags.h:216 [inline]
RIP: 0010:page_is_fake_head include/linux/page-flags.h:248 [inline]
RIP: 0010:PageTail include/linux/page-flags.h:292 [inline]
RIP: 0010:folio_flags include/linux/page-flags.h:319 [inline]
RIP: 0010:folio_unlock+0xc2/0x2f0 mm/filemap.c:1553
Code: 43 80 3c 3c 00 74 08 4c 89 f7 e8 a9 8a 27 00 4d 8b 36 4c 89 f6 48 83 e6 01 31 ff e8 a8 2a d6 ff 49 83 e6 01 0f 85 af 00 00 00 <0f> 1f 44 00 00 e8 b4 26 d6 ff 48 89 df be 08 00 00 00 e8 17 8c 27
RSP: 0018:ffffc9000ca2f808 EFLAGS: 00000246
RAX: ffffffff81ac41d8 RBX: ffffea0001362b80 RCX: ffff888044af8000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00fff00000080007 R08: ffffea0001362b87 R09: 1ffffd400026c570
R10: dffffc0000000000 R11: fffff9400026c571 R12: 1ffffd400026c571
R13: 1ffffd400026c570 R14: 0000000000000000 R15: dffffc0000000000
 filemap_map_pages+0xdd0/0x11e0 mm/filemap.c:3528
 do_fault_around mm/memory.c:4598 [inline]
 do_read_fault mm/memory.c:4624 [inline]
 do_fault mm/memory.c:4758 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x25e5/0x3d40 mm/memory.c:5292
 faultin_page mm/gup.c:1026 [inline]
 __get_user_pages+0x40d/0xec0 mm/gup.c:1250
 populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607
 __mm_populate+0x25c/0x380 mm/gup.c:1721
 mm_populate include/linux/mm.h:2891 [inline]
 vm_mmap_pgoff+0x212/0x2d0 mm/util.c:525
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9b0c1a94d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9b0cff9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f9b0c425fa0 RCX: 00007f9b0c1a94d9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f9b0c23804e R08: ffffffffffffffff R09: 000000001b5cb000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b0c426038 R14: 00007f9b0c425fa0 R15: 00007ffd3adb67a8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g152201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26864 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x13a0 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x9a/0x400 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 11203 Comm: kworker/u4:19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0x1148/0x1250 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 b3 08 0b 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 3f 05 0b 00 e9 34 ff ff ff f3 90 <41> 0f b6 04 1c 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 17 ff ff ff
RSP: 0018:ffffc90003ddf800 EFLAGS: 00000293
RAX: ffffffff81776383 RBX: dffffc0000000000 RCX: ffff888050635a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003ddf960 R08: ffffffff91b62247 R09: 1ffffffff236c448
R10: dffffc0000000000 R11: fffffbfff236c449 R12: 1ffff11017188641
R13: ffff8880b8d3bdc0 R14: 0000000000000000 R15: ffff8880b8c43208
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe65c5f0ce0 CR3: 000000000d88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1574 [inline]
 text_poke_bp_batch+0x2b7/0x850 arch/x86/kernel/alternative.c:1774
 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1972
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x11f/0x240 kernel/jump_label.c:207
 static_key_enable+0x16/0x20 kernel/jump_label.c:220
 toggle_allocation_gate+0xba/0x470 mm/kfence/core.c:821
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>